Stump-extractor



n sfrarns PATENT orrrcii. f j

JNO. D. AKIN, OF COLUMBUS TOWNSHIP, WARREN COUNTY, PENNSYLVANIA. i

STUMP-EXTRACTOR.

Specification of Letters Patent No. 1,500, dated february-26,v 1840. l

To all whom 'it m ay concern Be it known that I, JOHN D. ARIN, ofColumbus township, in the county of Warren and State of Pennsylvania,have invented a new and Improved Mode of Constructing Stump-DrawingMachines; and I do hereby declare that the following is a full and exactdescription.V

The nature of my invention consists in firmly sustaining in asubstantial, light and convenient frame-which moves like a carriage,upon wheels-a cog-wheel and axle, to which motion is communicated bymeans of an endless screw and shaft from a wheel worked by hand, in themode of constructing this frame and in the method of moving it, ashereinafter described, off from or over a stump, sidewise, by a fifthand eccentric wheel and easily again permitting its regular outwardmotion when it is perfectly clear of the stump.

To enable others skilled in the art to make and use my invention I willproceed to describe its construction and operation.

I make the wheels of my carriage A, Figure 1, of any convenient size,according to the nature of the ground upon which it is chiefly to beused, as, for example, 3 feet in diameter and 6 inches in tier. Myaxletrees B and B may be, for example 8 feet, so that the space betweenthe tracks may measure about 6 feet. The hind axle-tree B sustains abolster O which may be 5 feet 8 in. in length. This bolster andaxle-tree are firmly bolstered together and each lof them and also theforward axle-tree may be 7 by 9 inches in thickness. The forwardaxle-tree, also, sustains a bolster C', the iinder face of which forms asmall segment of a large circle touching the upper face of the axle-treeonly in its center. Through this point and through the bolster and theaxletree a pin passes, which is secured by a nut U, allowing the twoforward wheels free motion around the pin as a center, so that thecarriage may be turned in the same manner as carriages in common use.'Four upright posts, two and a section of a third of which arerepresented in the drawing and marked D, are raised upon the fourextremes of the two bolsters. They may be 5 feet long and 8 inchessquare. They sustain two plates, one of which is represented marked E,the upper faces of which are large elliptical segments. These plates runin the lengthwise direction of the carriage.

` inchesY thick.

They may be 8 by 16 in the centerand 8 by` l0y inches at each end. Uponthese plates and immediately above their centers. twoA king-posts F,Figs. l and 2, are erected and firmly vdovetailed to the-plates. Theking posts may be three feet long-and 6 by 10/ They are strengthened bybraces, which are mortised into the plates at a distance of about 24inches from their ends and also into vthe king posts abouti)AV inchesbelow their upper ends, the tenons.

being made firm into the mortises of the king posts by keys H, Fig. 2,so thatthey may be at any time tightened should ,theV

braces become loose from thel moving or action of the machine. Thesebracesare intended to aid in sustaining the plates in their positionagainst the resisting power of thelstump and act upon the principle ofthe arc i.

From the front surface of the king posts and also on the upper face ofthe plates two segments of a cylinder which is l2 inches in diameter arecut, passing through the point of contact of those faces. These segmentshave perpendiculars of two inches. In these segments the axle-tree ofthe cogwheel turns and is prevented from slipping forward or upward orout of them by two upright and horizontal posts X Y, Fig. 2. Of thecogwheel the axle, at its hub, which is 8 inches from the center (of theaxle), measures 20 inches, at the working post A" 18 and at its centersof motion l2 inches in diameter. From A" the chain which is attached tothe stump is suspended. It is wound around or unwound from the axle asthe axle turns. It hangs directly from the center of the machine. Thecog-wheel itself, J, may be 6 feet 3 inches in diameter and the cogsninety in number. It is moved by an endless screw K, which occurs upon asha-ft L, that is horizontal and parallel to the plates E. 'The shaft issustained at the forward end by a gudgeon and a stud S, which issupported by the two girts R, that are mortised into the forwarduprights. Toward the other end it passes through the orifices P cut inthe two studs N represented in section in Fig. 3. These studs aresupported in girts R', that are mortised into iio Vto be employed bothabove andbelowl Two keys vare driven'intothe openings O as'necessity mayrequire, so as to regulate the `po`'V sition of the orifice Pand raiseor'lower the -'shaft at will. y The shaft projects 3 feet be-` yondthese studs andbehind the carriage and terminates in. a wheelrM, which-may be 6 feet in diameter andris provided with `to'thefmaehine byhand.y p l,

Z is a stay to the frame.

pins perpendicular. to the tier ofthe wheel and two feet inlength wheremotion is given i and through mortises in the lower,v grts R land R andits tenons'are also mortised and held rmly'intheir position by keys'-VThis .stay is represented asV broken in the d`raw`4 is anV eccentricwheel,jrepresentedin section in Fig. 4. 'Its axlej passes through theeenterof the axle B. Its circumference gradually varies from a greatertoV a lesser diameter, the smaller of which, when Vit points directly tothe center of the earth,

Y wis ofsuch a length as to hang clear of the ground, but, also, 'sothat whenV it is drawn a little out ofthe plumb line in a directionopposite to that'of the expansion of its circumference that expansionshall cause the wheel to touch the p ground, thus'raising the two hindwheels o from the ground and the back of the machineupon the increasingsurface of itsth wheel, by Vwhich means the'back of the machine may bemoved the It passes intoV lengthV of one Irevolution ofthis 5th wheelsidevvise, over o-r off from a stump, when the back of the machine will`again fall `upon its hind Wheels and the-frontfwheels the plates in theposition represented and sustained there bytenons, `with which theirextremity terminates and which enter mortises inthe forward extremitiesof the plates. Their second extremity cut so as partially Vto enter 'theground. V

What I claim as myV invention and desire to secure byLetters-Patent is-The "employment of y he eccentric wheel for bringing the machine aboveor removingit from a stump `in a sidewise direction constructed andoperatngas herein described,`

JOHN D; AKIN.

Witnesses: i

WM. BISHOP, C. HrWILTBERGER.

